Torsion balancer



June 25, 1929. T. P HASE 1,718,634

' ToRsIoN BALANCER Filed April 2, 1928 S14/vento@ Zffafz @Chae dune ddy application nea aan a, rase. anni ne. teatri.

rlFhis invention relates to means for minimizing torsional'vibrations, particularly in engine crank shafts.

The invention comprises a torsion balancer having a balancing mass centered and halaneed about the axis et a crank shalt, disposed substantially within the planes ot one oit the webs of the shalt, and elastically connected to the shaltn 'l`he invention also consists ot combinations and details et structure more speciiically described hereinafter, defined in the appended claims and illustrated in the accomm panyiug drawings, in which: i

Fig l is an elevation ot a tour-throw 900 crank shaft fully counterweighted having the balancer ot this invention attached;

lllig. 2 is a vien' along the anis oit the shaft from the trout showing the balancer partly in section;

lig. 3 is a section on the broken line 3-3 Fig. l is a section along the broken line t-d ot lig. 2.

5 lfig. l illustrates a 900 crank shaft liul'ly counter-weighted adapted tor lnse with 900 tl-type 8 cylinder engines. rThe shailit is nrw vided with three journals designated trom :liront to rear by numerals l0,`ll and l2 ll..

30 heavy balance wheel 13 is secured as usual to the rear end ot the shalt. Counterweights are shown at ld and Mmaintainingg the shalt in dynamic balance. @ountcrweieht lt() is the 'lorward counterweigrht and is utilized to hold crank shaft spring abntinents of the balancer.

ln Figure l, this counterweight. is shown lragmentarily; part having been broken away through the connecting arm. "llhe eranlt pins are designated :from front to rear by numerals l5, lli, 17' and 18, crank pins 15 and 18 being,` 180 from each other and crank pins 16 and ll', "i800 from each other, but 90 'from crank pins l5 and t8.

llig. EZ shows counterweight ld() and the torsion balancer in elevation viewed trom the front end of the shalt. rllhe balancing mass 20, in the form shown, comprises a llat bar-like member 2l having a bearing stud 22 projecting from one side, this hearing stud being iournalled in a. here 23 extending through the journal l0 trom the liront end of the shaft and opening,- into the space rearward ot`the web 2d ot crank pin l5. @il

holes such as 23 permit oil trein the front bearingrn to nass into the bore 23 and lubrieate stad 22 and the hearing surtaces ot the bar 2L ln order to provide sul'hcient mass to give an adequate moment et inertia to the balancer, the ends thereof are materially thickeneda ln the term shown blocks 25 are bolted to the rlat bar 2l, one at each side oit the center. The bloclts 25 may he accurately positioned and itirmly held trom any sliding,` movement on the plate 2l by means ol' dowels 26, and clamped securely to said plate by screws 2l. llilanges 28 project inward from the forward side of the blocks 25 in such mann-er as to en l gage the forward side of web 2li in order to prevent axial displacement ot the balancer. Zlhese bloelrs 25 are thus disposed sulostann tially in the transverse planes occunied by web 2d and counterweight ld@ so that no additional length ot shalt is necessary to acu eonnnodate the balancer.

@ne edge ont the balancing body illustrated occupies a position transverse et line rep resenting the direction ot centritnggal torce on segmental eonnterweieht ldd and substantially parallel with the inner ed@ thereof shown in ltiig. 2. 'lfhat edge each hloclt which is nearest to the counterweiiyht is orovided with a cavity tl@ having at onnosite ends seats or abutments El tor the ot realt springs dit, eachl spring` nreterahly consisting ot several leaves.. The ende o'l the cavities El@ for :receivingP the sp1 e niet erably oll semi-circular form in cated at 333', the end contours olf the springtu corresponding. rlille semi-circular contour oit the cavity ends may thus be conveniently machined by means ot an end mill and the springs may be cnt by a die critter., lhe springs may be dropped into cavity and held in place by shalt-attached abntments 33 bearing on the springs between their ends, the ahutnients being preferably adjns 1'le and capable ot beingl loclred in adjusted position., Said abutments 33 may be adjnstahly secured. to the eonnterweight lltl; they may be in the :term oit capstan screws threaded into cavi ties 3ft tapped in counter-weight lltl, the heads 35 ot the screws bearin against the springs midway of their ends. ldeans tor loclring the abntments alter they have been adjusted to tension the springs properly may talre the form ot a loclr nut 36.

llt will loe apparent that this balancer is "particularly well adapted to shatts which are already in static and dynamic balance since it is symmetrical with respect to the shalt titl lll@

lltl

center. It also is adapted to be housed in the crank case and requires no lengthening of the shaft and no modification of the engine casing because it is within the same transverse space as that required for the orbit of counter-- lmass symmetrically balanced and pivoted -concentrically with the axis of the shaft, said mass having an adequate moment of inertia, spring seats symmetrically disposed on opposite sides of the pivotal axis, leaf springs supported on said seats, and abutments rigid with respect to the shaft -bearing upon said sprin s.

2. eans for controlling torsional vibrations of crank shafts lcounterweighted for static and dynamic balance,"comprising in combination with the shaft a balancing mass symmetrically balanced and pivoted concentrically with the axis of the shaft and having` an adequate moment of inertia, spring seats disposed on opposite sides of the pivotal axis, leaf springs supported on said seats, a counterweight rigid with the shaft and abutments on the counterweight bearing upon said springs. Y

3. Means for controlling torsional vibra-- tions in crank shafts counterweighted for static and dynamic balance comprising the combination of a crank shaft having a bore extending axially through its forward journal and o ening rearward of the front crank web, a ba ancing mass comprising a bar carrying a pin pivoted in said bore, said bar having thickened ends disposed symmetrically at opposite sides of the crank web, spring seats upon the balancing mass at opposite sides of its axis, springs in said spring seats, and abutments on the forward counterweight bearing upon said springs.

4. Means as defined in claim 3, in which the thickened ends of the balancing mass have flanges arranged to engage the web to prevent axial displacement of the balancing mass.

5. Means for controlling torsional vibrations, comprising a crankv shaft having an axial hole opening rearward of the forward crank web, a balancing mass comprising a bar having a central stud journalled in the hole, blocks bolted tothe bar on opposite sides of the crank web, and springs disposed between'the balancing mass and a part rigid lwith the shaft.

6. Means for controlling torsional vibrations, comprising a crank shaft having a hollow journal and an oil hole extending from the exterior to the interior of said journal, of an elastically mounted balancing mass having a stud extending into the hollow journal and lubricated by oil from the bearing.

7. The combination of a crank shaft with a torsional balancer symmetrically balanced about the axis of the shaft and substantially within the orbit traversed by one of the crank webs.

In testimony whereof I affix my si nature.

THERON P. C ASE. 

